Had a very small soda stream party. It was scheduled and held while the flu was active in our area. Then I took the goodies to friends homes who couldn't come. Over all everyone was impressed. The flavors we tried were very good.  easy to make, the carbonation level is up to you. So they taste good, are easy to make. However one friend did the math... the cartridge makes up to 60 liters, priced at walmart @ 30.00 dollars, then you also have to buy the flavor packets. So it seems to be a bit more expensive, yet you save the environment of all those two liter bottles............. If only soda stream could come down just a bit in the carbonation bottles it would be great. over all the product gets a thumbs UP